The temperature scale that places zero at the point where all atomic and molecular motion ceases is the Kelvin scale.

Here's why:

* Absolute Zero: The Kelvin scale is an absolute temperature scale, meaning it starts at absolute zero. Absolute zero is the theoretical temperature at which all matter has zero thermal energy. This is the point where all atomic and molecular motion stops.

* Other Scales: The Celsius and Fahrenheit scales are relative scales. They define zero based on arbitrary points (freezing and boiling points of water).

Let me know if you'd like more details on the Kelvin scale!